wifisd.icn: Procedure to convert WIF to xencoded ISD

link wifisd
April 6, 2002; Ralph E. Griswold
This file is in the public domain.

This procedure analyzes a Weaving Information File and returns xencoded
ISD.

Information in a WIF that is not necessary for an ISD is ignored.

If there is a liftplan, the symbols in the treadling sequence
correspond to shaft patterns given in the liftplan.  The symbols
for these pattern shafts are implicit and occur in orde to the number
of shaft patterns.

There is a problem where there is treadling with multiple treadles
and no liftplan.  *Presumably* that treadling can be used like a
liftplan, but without, necessarily, a direct tie-up.  This problem
problem has not been addressed yet.

If there is a liftplan, then a direct tie-up is implied by the
wording in the WIF documentation.  However, that's in the interpretation
of the draft.  The tie-up produced here is the one given in the WIF.

If there is a liftplan and a treadling with multiple treadles,
the treadling is ignored.

This procedure does not attempt to detect or correct errors in WIFs,
but it does try to work around some common problems.